MODIS level-2 fire data acquired March 8, 2007 were used to create these images. Pixels are color-coded using the MOD14 Fire Mask to highlight fires in yellow, water bodies in blue, and clouds in cyan, while land areas are left black.
This image is a subset of the full swath. The subset is centered to the south along the Florida Panhandle between Panama City and Tallahassee, and shows several of the prescribed fires burning throughout the southern U.S. on that date.
MODIS Thermal Anomalies/Fire products are primarily derived from MODIS 4- and 11-micrometer radiances. The fire detection strategy is based on absolute detection of a fire (when the fire strength is sufficient to detect), and on detection relative to its background (to account for variability of the surface temperature and reflection by sunlight). Numerous tests are employed to reject typical false alarm sources like sun glint or an unmasked coastline.
MOD14 is level-2 swath data provided daily at 1-kilometer resolution. The Science Data Sets in this product include fire-mask, algorithm quality, radiative power, and numerous layers describing fire pixel attributes.
The Terra MODIS instrument acquires data twice daily (10:30 AM and PM), as does the Aqua MODIS (1:30 PM and AM). These four daily MODIS fire observations serve to advance global monitoring of the fire process and its effects on ecosystems, the atmosphere, and climate.
Version-5 MODIS/Terra Thermal Anomalies/Fire products are Validated Stage 1, meaning that accuracy has been estimated using a small number of independent measurements obtained from selected locations and time periods and ground-truth/field program efforts. Although there may be later improved versions, these data are ready for use in scientific publications.
Temporal Coverage | February 24, 2000 - |
Area | ~2330 x 1300 kilometers |
Dimensions | 2030 x 1354 rows/columns |
File Size | ~0.4 MB |
Resolution | 1 kilometer |
Projection | None (swath data) |
Fire Mask Data Type | 8-bit unsigned integer |
Data Format | HDF-EOS |
Science Data Sets (SDS HDF Layers) | 23 |
Dimensions | 3 ( row x column x Fire Pixel Table) |
Science Data Sets for MODIS/Terra Thermal Anomalies/Fire 5-Min L2 Swath 1km V005 (MOD14):
Science Data Sets (HDF Layers) (23) |
UNITS |
BIT TYPE |
FILL |
VALID RANGE |
---|---|---|---|---|
Fire mask | Class | 8-bit unsigned integer | 0 | 0–9 |
Algorithm QA | Bits | 32-bit unsigned integer | 4294967295 | 0–4294966531 |
Fire Pixel Table | This table is stored as a third dimension for each Fire Pixel. It has 21 columns of information relevant to a Fire Pixel. Each column is stored as a separate SDS to accommodate limitations in the HDF format. |
MOD14 FIRE MASK
Classes |
---|
0 not processed (missing input data) |
1 not processed (obsolete; not used in post-launch product) |
2 not processed (other reason) |
3 water |
4 cloud |
5 no fire |
6 unknown |
7 fire (low confidence) |
8 fire (nominal confidence) |
9 fire (high confidence) |
The QA information below is excerpted from the MOD14.005 file specification.
MOD14.005 QA Descriptions (32-bit)
Bit No. |
Parameter Name |
Bit Comb. |
Algorithm_QA |
---|---|---|---|
0–1 | MODLAND QA bits | 00 | Fire/no-fire determined at optimum confidence |
01 | Fire/no-fire determined at less than optimum confidence | ||
10 | No determination made due to cloud cover | ||
11 | No determination made due to other reason(s) | ||
2 | 3.9 micron high-gain flag | 0 | band 21 used |
1 | band 22 used | ||
3 | Atmospheric correction | 0 | Not performed |
1 | Performed | ||
4 | Day/night algorithm | 0 | Night |
1 | Day | ||
5 | Potential fire pixel | 0 | No (if no, remaining QA fields except bit 23 are not set) |
1 | Yes | ||
6 | Spare (set to zero) | 0 | Spare |
7–10 | Background window size parameter, R | R = 0 | Unable to characterize background |
R > 0 | Background characterized with (2R+1) by (2R+1) window | ||
11 | 360 K T21 test | 0 | Fail |
1 | Pass | ||
12 | DT relative test | 0 | Fail |
1 | Pass | ||
13 | DT absolute test | 0 | Fail |
1 | Pass | ||
14 | T21 relative test i | 0 | Fail |
1 | Pass | ||
15 | T31 relative test ii | 0 | Fail |
1 | Pass | ||
16 | Background fire T21 deviation test | 0 | Fail |
1 | Pass | ||
17–20 | Spare (set to zero) | 0 | Spare |
21 | Adjacent cloud pixel (valid only if fire mask = 7, 8, or 9) | 0 | No |
1 | Yes | ||
22 | Adjacent water pixel (valid only if fire mask = 7, 8, or 9) | 0 | No |
1 | Yes | ||
23 | Sun glint level | 0–3 | |
24 | Sun glint rejection flag | 0 | False |
1 | True | ||
25 | Hot surface boundary rejection flag | 0 | False |
1 | True | ||
26 | Coastal false alarm rejection flag | 0 | False |
1 | True | ||
27–31 | Spare (set to zero) | 0 | spare |
V005 MOD14 Fire Pixel Table
This table is stored as a third dimension for each Fire Pixel. It has 21 columns of information relevant to a Fire Pixel, but for ease of expression, these columns have been transposed into rows on this table.
Name |
Units |
Data Type |
---|---|---|
FP_line: Granule line of Fire Pixel |
Line Number | 16-bit signed integer |
FP_sample: Granule sample of Fire Pixel |
Sample Number | 16-bit signed integer |
FP_latitude: Latitude of Fire Pixel |
Degree | 32-bit floating point |
FP_longitude: Longitude of Fire Pixel |
Degree | 32-bit floating point |
FP_R2: Channel 2 reflectance of Fire Pixel |
Reflectance | 32-bit floating point |
FP_T21: Channel 21/22 brightness temperature of Fire Pixel |
Kelvin | 32-bit floating point |
FP_T31: Channel 31 brightness temperature of Fire Pixel |
Kelvin | 32-bit floating point |
FP_MeanT21: Channel 21/22 brightness temperature of background |
Kelvin | 32-bit floating point |
FP_MeanT31: Channel 31 brightness temperature of background |
Kelvin | 32-bit floating point |
FP_MeanDT: Mean background brightness Temperature Difference |
Kelvin | 32-bit floating point |
FP_MAD_T21: background channel 21/22 brightness temperature Mean Absolute Deviation |
Kelvin | 32-bit floating point |
FP_MAD_T31: background channel 31 brightness Mean Absolute Deviation |
Kelvin | 32-bit floating point |
FP_MAD_DT: background brightness Temperature Difference Mean Absolute Deviation |
Kelvin | 32-bit floating point |
FP_power: fire radiative power |
Megawatts | 32-bit floating point |
FP_AdjCloud: number of adjacent cloud pixels |
Number | 8-bit unsigned integer |
FP_AdjWater: number of adjacent water pixels |
Number | 8-bit unsigned integer |
FP_WinSize: background window size |
Number of Pixels | 8-bit unsigned integer |
FP_NumValid: number of valid background pixels |
Number | 16-bit signed integer |
FP_confidence: detection confidence |
Percent | 8-bit unsigned integer |
CMG_Day: Climate Modeling Grid information |
Data stored within these SDSs are used in the production of an upcoming fire CMG product. | |
CMG_night: Climate Modeling Grid information |
Please find the current MODIS-related Data Redistribution and Pricing policies on the MODIS Policies Section of this Web Site
LP DAAC Acknowledgement and Citations Policy
In the event that data distributed from the Land Processes DAAC are incorporated into your research, please supply the following acknowledgment within your published work: "These data are distributed by the Land Processes Distributed Active Archive Center (LP DAAC), located at the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (lpdaac.usgs.gov)." If possible, please e-mail or send us reprints/citations of papers or oral presentations based on data obtained from the LP DAAC (see below for mailing address and e-mail address). This will help us to stay informed of how the data are being utilized.
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Sioux Falls, SD 57198-0001
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U.S. Geological Survey (USGS)
Center for Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001
Phone Number: | 605-594-6116 |
Toll Free: | 866-573-3222 |
866-LPE-DAAC | |
Fax: | 605-594-6963 |
Email: | lpdaac@eos.nasa.gov |
Web: | http://lpdaac.usgs.gov |